I'd definitely have to go with von Hohenheim from Fullmetal Alchemist (the manga and Brotherhood). Did he leave his wife and children? Yeah, but he did it to save them and the rest of their country from a fate worse than death. Despite how he acts and looks, he cares SO FREAKING MUCH for his kids. And if that epilogue in the manga where he meets up with Trisha doesn't make you tear up and think "That dude is freaking awesome", then you have no soul... "Ed finally called me dad"